CVE-2025-49706 — Microsoft SharePoint Enterprise Server 2016
CISA KEVRansomwareAs of 2026-08-04, CVE-2025-49706 is a MEDIUM-severity vulnerability in Microsoft SharePoint Enterprise Server 2016, CVSS v3.1 6.5, EPSS 99.0% (99.9th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-07-22), with a US federal remediation deadline of 2025-07-23, and CISA links it to known ransomware campaigns. Threadlinqs Intelligence links 4 tracked threat campaigns to CVE-2025-49706, most recently “Warlock Ransomware Attackers Hit Water and Telecom Operators via SharePoint ToolShell Exploitation (Longlegs / Storm-2603)”.
Last updated: 2026-08-04
What is CVE-2025-49706?
Improper authentication in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
The record classifies CVE-2025-49706 under weakness class CWE-287. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 3 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 451 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 6.5 — MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:F/RL:O/RC:C - EPSS (FIRST)
- 99.0% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs
- CISA KEV
- Listed since 2025-07-22, federal remediation deadline 2025-07-23 — used in known ransomware campaigns
- Threadlinqs priority
- 10/10 — CISA lists it as used in ransomware, which Threadlinqs scores at the maximum
- Published
- 2025-07-08, last modified 2026-08-04
Is CVE-2025-49706 being exploited?
CISA added CVE-2025-49706 to the Known Exploited Vulnerabilities catalog on 2025-07-22, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2025-07-23 under BOD 22-01. CISA flags the vulnerability as one used in known ransomware campaigns. Weaponised exploit code for CVE-2025-49706 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. A ProjectDiscovery Nuclei detection template exists (http/cves/2025/CVE-2025-49706.yaml). It currently carries a trending score of 45 in the Threadlinqs vulnerability feed.
- AdityaBhatt3010/CVE-2025-49706-SharePoint-Spoofing-Vulnerability-Under-Active-Exploitation (github)
- trickest/cve (trickest)
Affected products and versions
- Microsoft: SharePoint Enterprise Server 2016, SharePoint Server 2019, SharePoint Server Subscription Edition
How to fix CVE-2025-49706
Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-49706. Because CVE-2025-49706 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2025-07-23. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2025-49706
4 tracked threats in the Threadlinqs corpus reference CVE-2025-49706, either in the campaign’s CVE list or as an indicator on the campaign record.
- Warlock Ransomware Attackers Hit Water and Telecom Operators via SharePoint ToolShell Exploitation (Longlegs / Storm-2603) — CRITICAL · 2026-10-01
- CVE-2026-56164: Microsoft SharePoint Server Missing-Authentication Vulnerability Actively Exploited, Added to CISA KEV — CRITICAL · 2026-07-15
- CVE-2026-45659: SharePoint Deserialization RCE Added to CISA KEV Amid Storm-2603 Exploitation — HIGH · 2026-07-02
- CVE-2026-45659: Microsoft SharePoint Deserialization RCE Actively Exploited, Added to CISA KEV — HIGH · 2026-07-02
Sources
Enriched from CVE.org, NVD, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories, ProjectDiscovery Nuclei. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.
Vendor advisory and patch
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